I do mean humane relocation, not slow down to 60 and toss hime out the window
There might be a spray that you can put on the top to repel cats. I had this stuff to keep my puppies from chewing up my stuff. "Bitter ???"
I feel your pain as when i visit my mother her garage cat loves to spread hair on my top. I did find a "non" sticky lint roller workes pretty well.